NEW YORK—Norwegian Casper Ruud harnessed his mighty forehand to reach his second Grand Slam final this year by beating Russian Karen Khachanov 7–6(5), 6–2, 5–7, 6–2 at the U.S. Open. Fifth seed Ruud showed he could go the distance having survived an extraordinary 55-shot rally to close the first-set tiebreak and next faces either home…